Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 77)

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(3) Carefully open the container/wrench and remove the
LIF. Refer to Figure 2-11.
Figure 2-11. LIF.
(4) Hold the LIF by the ridged end (see Figure 2-11) and
thread it clockwise, into the objective lens.
Do not overtighten the LIF into the objective lens.
(5) Using the ridged side of the container/wrench as a
wrench, engage the ridges on the container with the ridges on the
LIF and tighten the LIF hand tight.
(6) Place the empty container/wrench back into the carrying
case.
CAUTION